I am so tired these days. I look forward __________ this weekend.[ ]

A. to going on a trip

B. to go on a trip

C. going on a trip

D. go on a trip

CT摄片与普通摄片的共同点是()

A．曝光方式 

B．胶片使用 

C．冲洗过程 

D．灰度调整 

E．幅式设计